Fuel injector



G. A. GILLEN FUEL INJECTOR Feb. 8, 1938.

Filed Oct. 7, 1936- V GEORGE/1. GILLE/V m 2R V 0 m Patented Feb. 8, 1938,I1-:-UNITTED STATES PATENT OFFICE fiThis invention relates to enginesof the liquid:

fuelinjection type.

c Special objects of the inventionare to provide afuelinjector'whichwill be of simple, sturdy design, free of complicated or delicate partsandwhich will be self-clearing so as to overcome any fouling or carbonforming tendencies.

7 These and other desirable objects are attained a why the novelfeatures of construction, combinations and relations of partshereinafter described, a

j illustrated and broadly claimed. P'In'the accompanying drawing apractical and at "present preferred embodiment of the invention isshown, but it will be understood thatthe actual physical structure maybe modified and I changed in various ways, all within the true' intentand broad scope of the invention.

1 1 igure 1 is a'broken longitudinal sectional view lot one form of theinjector.

i Figure 2 is a transverse sectional view as on I substantially theplane of line 2-2 of Figure 1. V The injector consists of but three mainparts,

a stationary supply tube or nozzle 3, a surrounding piston sleeve 4having a head or closed end 5 closing the open discharge end 6 of thenozzle tubeand a casing sleeve 1 surrounding the movable piston sleeve.

, The head of the piston sleeve is shown as extended as an annularflange 8 to overlap and engage the end 9" of the casing sleeve and ashaving in its inner face a cylindrical seat lllfor 1 receiving the endof the nozzle tube. The bottom of this seat is shown as conical at I lto provide clearance at the end of. the tube.

Atomizing ports I2 are shown provided in the piston sleeve back oftheflange 8 and back of 'the'seat I0 so that the surrounding casing andthe enclosed tube will operate as cutoffs for the opposite ends of portsl2 when the pistonsleeve is retracted as shown.

The outer end of the casing 1 is shown as formed with a cavity [3 aboutthe piston sleeve for the reception of a retracting spring [4 which issupported at the inner end on a seat or 45 Shoulder l5 and at its outerend acts against an abutment shoulder shown as a flange l6 screwed onthe outer end of the piston sleeve.

The nozzle tube 3 isv shown as supported by having an annular headportion I! at its outer 50 end screwed onto the hub portion H3 at theouter end of the casing sleeve. The latter is indicated as having amounting flange 19 by which the structure may be secured in the enginehead 20.

I 55 Liquid fuel under pressure is conducted to the are closed andsealed at both ends, at the inner ends by the supply or, nozzle tube 3and at the stationary supply tube through suitable high pressure tubing2| shown as connected with the end of the supply tube by screw flange22.

In the position shown, the atomizing ports I2 of the atomizing ports [2which then spray or atomize the liquid into the cylinder through thespace then provided between the end 9 of the casing 1 and the flange 8of the piston head. The pump for creating the piston shifting and 20atomizing pressure is not illustrated as the structure of the same mayvary widely and it may be made as a part of the injector or as aseparate pump structure.

What I claim is: 25

1., A fuel injector comprising a stationary liquid fuel supply tubehaving an open discharge end, a piston sleeve slidable over saidstationary tube and having a closed end covering the discharge end ofsaid stationary tube and thereby sub- 30 jected to pressure of liquid insaid tube, a stationary casing about said piston sleeve, a flange at theclosed end of said piston sleeve for abutment with the end of saidcasing, said piston sleeve having a port or ports back of said flangeand closed at opposite ends by said supply tube and surrounding casingwhen said piston sleeve is retracted against the end of the casing andmeans for holding said piston sleeve retracted against pressure ofliquid in said supply tube.

2. A fuel injector comprising a stationary liquid fuel supply tubehaving an open discharge end, a piston sleeve slidable over saidstationary tube and having a closed end covering the discharge end ofsaid stationary tube and thereby subjected to pressure of liquid in saidtube, a stationary casing about said piston sleeve, a flange at theclosed end of said piston sleeve for abutment with the end of saidcasing, said piston sleeve having a port or ports back of, said flangeand closed at opposite ends by said supply tube and surrounding casingwhen said piston sleeve is retracted against the end of the casing andmeans for holding said piston sleeve retracted against pressure ofliquid in said supply tube, in-

eluding a spring housed within the casing about the piston sleeve, thecasing having a supporting shoulder for one end of said spring and thesleeve having an abutment shoulder for the opposite end of said spring.

3. A fuel injector comprising a stationary liquid fuel supply tubehaving an open discharge end, a piston sleeve slidable over saidstationary tube and having a closed end covering the discharge end ofsaid stationary tube and thereby subjected to pressure of liquid in saidtube, a stationary casing about said piston sleeve, a flange at theclosed end of said piston sleeve for abutment with the end of saidcasing, said piston sleeve having a port or ports back of said flangeand closed at opposite ends by said supply tube and surrounding casingwhen said piston sleeve is retracted against the end of the casing andmeans for holding said piston sleeve retracted against pressure ofliquid in said supply tube, theclosed end of said piston sleeve having aseat receiving the end of the supply tube.

4. A fuel injector comprising a stationary liquid fuel supply tubehaving an open discharge end, a piston sleeve slidable oversaidstationary tube and having a closed end covering the discharge endof said stationary tube and thereby subjected to pressure of liquid insaid tube, a stationary casing about said piston sleeve, a flange at theclosed end of said piston sleeve for abutment with the end of saidcasing, said piston sleeve having a port or ports back of said flangeand closed at opposite ends by said supply tube and surrounding casingwhen said piston sleeve is retracted against the end of the casing,means for holding said piston sleeve retracted against pressure ofliquid in said supply tube and cooperating parts at the outer end of thesupply tube and easing by which said supply tube is supported in spacedrelation within said casing.

5. A fuel injector, comprising a casing sleeve having an open inner end,a nozzle sleeve secured in spaced relation within said casing sleeve andhaving an open inner end adjacent the open inner end of the casingsleeve, a piston sleeve operating in the space between said casing andnozzle sleeves and having a closed end over the open inner end of thenozzle sleeve and an annular projecting flange overlying the end of thecasing sleeve, said piston sleeve having a port or ports back of saidflange in position to be closed at opposite ends .by said casing sleeveand nozzle sleeve when said piston sleeve is retracted, a retractingspring about the outer portion of said piston sleeve, an abutmentshoulder for said spring on the outer end of said piston sleeve and asupporting shoulder in the outer end portion of said casing sleeve forthe inner end of said retracting spring.

GEORGE A. GILLEN.

